Which alloy of zinc is used in simple voltaic cell?

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An alloy is a physical mixture of two different metals forming a homogeneous mixture.

A voltaic cell uses differences in oxidation potential of two metals to generate an electric current.  The original voltaic cells were stacks of copper and zinc alternating, with an electrolyte between the pieces of metal.   Alloys were not used in these cells, just the pure metals.

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Which alloy of zinc is used in voltaic cell?  

Voltaic cells are the electrochemical cells that generate electricity. In common usage these cells are known as batteries (since a battery contains one or more of such cells). These cells operate on redox reactions between metals. In simple terms, one metal electrode loses electrons and the other electrode gains them. This flow of electrons generates electricity. Once the chemical reaction is done, the battery discharges. 

Copper and zinc are commonly used as the electrodes, with the zinc anode undergoing oxidation (losing electrons) and the copper cathode undergoing reduction (gaining electrons), thus completing the redox reaction. 

An alloy is a heterogeneous mixture of two or more metal elements. In the case of voltaic cells, we use pure metals as electrodes and not their alloys. So, we use pure zinc and not its alloy in a voltaic cell.

Hope this helps. 

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